Solutions1. Baseband transmission means sending a digital or an analog signal without modulation using a low-pass channel. Broadband transmission means modulating a digital or an analog signal using a band-pass channel. 2. Optical signals have very high frequencies. A high frequency means a short wavelength because the wavelength is inversely proportional to the frequency ( = c/f), where c is the propagation speed in the media. 3. The frequency domain of a voice signal is normally continuous because voice is a nonperiodic signal.

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